The three volume Rise and Fall of the Roman Empire covers several observers of the decline. It’s ironic how much of the decline is directly related to sexual depravity, including homosexuality. Ironic in the sense that sexual depravity is sold in modern America has the height of liberty.
We have a group of hedonistic sociopaths running the country for their personal benefit and pleasure. Remember the pedophile from Belgium who, once caught, claimed a sexual perverse conspiracy that included top government officials and Belgian’s rich?
I believe that story and believe it applies to the US as well.
The best take on that topic I've found is Machiavelli's Discourses on Livy. He did have a tendency to idealize the early pieces but whether he believed Livy's every word or merely pretended to is a little hard to determine. Great stuff.